4a37d08382
This was a pre-SkOpts attempt that we can bring under its wing now. This should be a perf no-op, deo volente. BUG=skia:4117 Review URL: https://codereview.chromium.org/1314863006
36 lines
1.1 KiB
C++
36 lines
1.1 KiB
C++
/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkBlitRow_opts_DEFINED
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#define SkBlitRow_opts_DEFINED
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#include "Sk4px.h"
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namespace SK_OPTS_NS {
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// Color32 uses the blend_256_round_alt algorithm from tests/BlendTest.cpp.
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// It's not quite perfect, but it's never wrong in the interesting edge cases,
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// and it's quite a bit faster than blend_perfect.
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//
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// blend_256_round_alt is our currently blessed algorithm. Please use it or an analogous one.
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static void blit_row_color32(SkPMColor* dst, const SkPMColor* src, int count, SkPMColor color) {
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unsigned invA = 255 - SkGetPackedA32(color);
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invA += invA >> 7;
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SkASSERT(invA < 256); // We've should have already handled alpha == 0 externally.
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Sk16h colorHighAndRound = Sk4px::DupPMColor(color).widenHi() + Sk16h(128);
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Sk16b invA_16x(invA);
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Sk4px::MapSrc(count, dst, src, [&](const Sk4px& src4) -> Sk4px {
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return (src4 * invA_16x).addNarrowHi(colorHighAndRound);
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});
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}
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} // SK_OPTS_NS
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#endif//SkBlitRow_opts_DEFINED
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